Active chilled beams supply conditioned fresh air (primary air) to the space from a central plant room to maintain indoor air quality whilst providing additional cooling and/or heating using heat exchangers.

The primary air is discharged into the beam mixing chamber via nozzles. As a result of this secondary air is induced via an inlet grille and then passes through a horizontally mounted heat exchanger into the mixing chamber. Both air flows mix and the total supply air is discharged horizontally into the space through integral slot diffusers.

There are eight nominal lengths each having four nozzle options. This allows the optimum selection to meet fresh air flow rate and thermal capacity requirements whilst exhibiting low differential pressures and sound power level characteristics.

There are two types of heat exchanger, one is a two pipe system for cooling, heating can be provided using a changeover mode. The other is a four pipe system which enables any room to be cooled or heated independently of other rooms. Operation below the dew point (wet operation) must be avoided.